Residents across a wide swath of France, from the Rhône Valley to the Mediterranean coast, are bracing for a deluge this Thursday, November 12, as Météo-France warns of heavy rainfall and localized thunderstorms.
While the north of the country, including Paris and Lille, remains dry, the south is preparing for heavy rainfall that threatens to flood low-lying areas and basements.
Nice is expected to bear the brunt of the weather system, with forecasts indicating up to 73 millimeters of rain throughout the day. To put that volume into perspective, Selectra notes that for a 20-square-meter courtyard, this equates to 1,460 liters of water. Other cities are also on high alert, with Biarritz and Toulon expecting 46 millimeters, Lyon anticipating 44 millimeters, and Nîmes braced for 42 millimeters.
The sudden influx of water poses a specific risk to residential basements and underground parking facilities. According to Météo-France, water can rise rapidly, potentially blocking exits and damaging electrical systems. Residents in affected areas are advised to clear items from floor level before the rain intensifies. This includes moving extension cords, power strips, cardboard boxes, and stored materials like wood pellets to higher ground.
If you possess a sump pump, now is the time to verify its operation. Selectra advises that vehicles parked in underground garages should be moved to higher ground, as even a few centimeters of water can immobilize a car and complicate insurance claims.
Electrical safety is paramount. The general circuit breaker should be identified before the storm hits, not while you are standing in water. Sensitive electronics such as computers, televisions, and internet routers should be unplugged to protect them from lightning-induced power surges. However, Selectra emphasizes that if the electrical panel is already surrounded by water, you must avoid it entirely and contact a professional.
The weather outlook shifts rapidly after Thursday, with a sharp drop in temperatures expected across the region. In Lyon, for instance, the mercury is forecast to fall from a high of 19.1°C on Wednesday to just 9.6°C by Friday, November 13, as reported by Selectra SAS. Similar cooling trends are expected in Saint-Étienne, Clermont-Ferrand, and Grenoble.
“A boiler or water heater that has been touched by water cannot be restarted without a professional,” Selectra advises, noting that water infiltration into internal circuits creates a high risk of short-circuits.
The impact of this system varies significantly by location. In Lyon, the day is characterized by persistent, heavy rain. Lyon Capitale reports that residents should expect rain from morning through evening, with temperatures hovering around 14°C, slightly above seasonal norms.
Ouest-France indique que la situation dans la région lyonnaise restera grise et humide, avec des rafales de vent attendues jusqu’à 55 km/h durant la nuit du jeudi 12 au vendredi 13 novembre 2026.
While the current forecasts are based on data updated through November 10, weather patterns remain dynamic. Residents are encouraged to consult the Météo-France vigilance map throughout the morning for the most current updates on their specific commune.
Whether the storm will track exactly as predicted or shift intensity remains a question that local authorities continue to monitor as the front moves from the Southeast toward the Southwest, tracking through the Massif Central.
